
Marine Timekeeper known as 'H5' by John Harrison and Son 1770
1770
1770
1801-1830
1783-1800
1831
1799-1802
1777-1785
1831
1760-1775
1829
1775
1801
1066; 1876
1751-1800
1788
1752
1762
1798
1755
1756-1800
1797
1893-4
1805
1800
1780
1770-1800
1812
1805-1815
1830
1760-1790
1795
circa 1808
1775-1799
1785-1795
2000-100 BCE
1813
1771-1800
1778
1771-1830
1783
1793-1803
1821-1831
1955; 1830
1826
1801-1830
1801-1830
1776-1780
1801-1830
1815-1825
1801-1830
1776-1780